Problems, problems

[valjo]

i have problems at my s2 aby.... i have made "ladendruck" test, and i found out that i had one leak infront intake mainfold. I think it is one of gas hoses who leaks. Is it possible?

thanks for answer!!

[Martynf]

Valjo,

There are so many possible hoses that can leak on the ABY!, The 'Ladendruck' I had translated as 'loading jerk' ? not quite sure the translation worked very well!

So the only thing I can think of your problem is is an air leak in any of the vacuum lines or turbo pipes. You will have to look at all of your hoses to see if you can see any splits,or any hoses that looks 'old' and needs to be replaced.

Sorry cannot be more specific, I'm not sure what the test is you performed.
Martyn

[valjo]

martyn: i pump the air into turbo intake and i am looking for any lakes in system. I heard that soma air is coming infront of intake mainfold. I agree that there is a lot of small hoses.. so i need to find out whitch one is leaking .
I have problems with performance, when i floored the gas sometimes car just want pull over.... Sometimes it is look like engine doesnt get gas or sth. because car complitly blocked ;(

[Mark Halligan]

Valjo,

Have you tried checking the Intercooler O ring seal as this can leak a lot of air if faulty and it sounds as though you may have quite a big leak .

Mark.

[valjo]

mark: i allready checked out my o ring and it is ok. I had some leakness infront intake mainfold (i am suspecting breather hose system) It is very hard to go close to thise area so i need some times.
I wanna know if anyone has similare problems with leaks infont intake mainfold.:confused:

[Martynf]

Valjo

Sounds like you do have one of the breather hoses leaking air then. I had my main water rad out recently and whilst it was out I checked every breather hose in the engine bay. With the rad out you can quite easily get to all of the breather hoses. With the rad on, not very easy to get to any of the breather hoses.

One of the mechanics at the garage where I used to work at years ago had a really neat trick for finding air leaks. You fill a water spray bottle, the type you use to spray water on plants, with some washing up liquid and water, then spray loads of the water onto the pipe. If there is air leaking, the air will cause the washing up liquid to 'blow bubbles' which you can easily see!!

I haven't had this problem, yet.... but I do know the breather hoses do need replacing sooner or later.

I hope you find the leak Valjo.
Martyn

[S2central.net]

THE most popular hose leak I find on the ABY engine is the narrow hose from very front tip on inlet manifold which goes to the throttle bypass valve (via a metal tube at the end of the fuel rail).

Paul

[valjo]

martyn thanks for that advices i will try it today. Paul i think i have leaking somwhere you said. Today i get etka map for hoses behind intake mainfold and i will check it !

Can be these leaks responsible for bad acceleration ? When i floored gas in 2th gear i get filing engine should block (like rev limits at 700rpm). I checked AFM connectors allready, all turbo ventils are rebuild, wast gate diaphragma checked... what can be wrong?

[S2central.net]

ANY leak in the intake and ventilation system will give running problems.

A large enough leak will cause excessive overboost and the engine will cut at 4000rpm by a safety feature of the ECU.

Its really tiresome and boring, but you have to check ALL hoses - and the intercooler, its O-ring and all the narrow guage tubes as well.

Good luck !

Another possible fault is broken throttle bypass valve, wastegate frequency valve, idle stabiliser valve or a bad MAF.


Paul

[valjo]

paul : how can i test MAF sensors for errors? I clean connectors allready. Is wast gate frequency valve equal to wast gate solenoid walve or what it is?

[S2central.net]

MAF can be tested with a multimeter - using instructions on S2 Central in the Technical / Motronic section. Better to test with VAGCOM if possible.

Yes wastegate frequency valve (WGFV) can also be called what you said

Paul

[valjo]

paul look like i cant navigate your web page. i checked it all but i havent find introductions how to check MAF. Can u give me direct link pleas!
Today i went to job and my car pull like a bull without any problems But yesterdey car doesnt go as it should.... do u know why ?

thanks

[sla_s2]

this happens with my s2 all the time valjo ...

sla

[valjo]

sla: and what will you do about it?

em i had cleaned connectors of MAF sensors and last 3 days S2 runs great

[sla_s2]

valjo, i have already changed one intercooler hose and looks like i have to check the "O" ring. maf could be possible problem too, 'cause when i bought the car i've noticed that the maf's box with microschemes was opened...

sla